This preview shows page 1. Sign up to view the full content.
Problem 14.7
Given:
The stress concentration factor for a hole in a beam is
approximately 3.0 if the diameter of the hole is small compared
to the depth of the beam.
Two 10.0mm diameter holes are
drilled through the beam at equal distances from the
neutral
surface.
Use the moment of inertia for the net section through
the holes and S
cc
= 3.0.
Find:
the magnitude of the bending moment M for the case in
which the limiting flexural stress is 120 MPa.
a) for y'=50.0 mm to the outer edges of the holes
b) for y'=75.0 mm
Solution:
The maximum stress is:
σ
120 MPa
⋅
:=
S
cc
3
:=
σ
My
⋅
I
x
S
cc
⋅
=
a)
I
x
50 mm
⋅
200 mm
⋅
()
3
⋅
12
2
50 mm
⋅
10 mm
⋅
3
⋅
12
50 mm
⋅
10
⋅
mm
⋅
45 mm
⋅
2
⋅
+
⎡
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 01/11/2011 for the course MAE 3040 taught by Professor Mechanicsofsolids during the Spring '10 term at Utah State University.
 Spring '10
 MechanicsofSolids
 Stress

Click to edit the document details